/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: SingletonIterator.java,v 1.2.4.1 2005/09/06 10:15:18 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.dom;

import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 */
public class SingletonIterator extends DTMAxisIteratorBase {

  private int _node;
  private final boolean _isConstant;

  public SingletonIterator() {
    this(Integer.MIN_VALUE, false);
  }

  public SingletonIterator(int node) {
    this(node, false);
  }

  public SingletonIterator(int node, boolean constant) {
    _node = _startNode = node;
    _isConstant = constant;
  }

  /**
   * Override the value of <tt>_node</tt> only when this
   * object was constructed using the empty constructor.
   */
  public DTMAxisIterator setStartNode(int node) {
    if (_isConstant) {
      _node = _startNode;
      return resetPosition();
    } else if (_isRestartable) {
      if (_node <= 0) {
        _node = _startNode = node;
      }
      return resetPosition();
    }
    return this;
  }

  public DTMAxisIterator reset() {
    if (_isConstant) {
      _node = _startNode;
      return resetPosition();
    } else {
      final boolean temp = _isRestartable;
      _isRestartable = true;
      setStartNode(_startNode);
      _isRestartable = temp;
    }
    return this;
  }

  public int next() {
    final int result = _node;
    _node = DTMAxisIterator.END;
    return returnNode(result);
  }

  public void setMark() {
    _markedNode = _node;
  }

  public void gotoMark() {
    _node = _markedNode;
  }
}
